1. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 Distributed Data Analysis in HEP Piotr MALECKI Institute of Nuclear Physics Kawiory 26A, 30-055 Kraków, Poland piotr.malecki@ifj.edu.pl See: Celso Martinez Rivero Instituto de Fisica de Cantabria, Santander Presentation at Brussels negotiations, 24 Oct 2001 http://www.ifca.unican.es

2. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 Contents: High Energy Physics for GRID HEP = events HEP = people what events what people Subtasks (of task 1.3) interactive acces to distributed databases (1.3.1) data-mining techniques (1.3.2) integration with experiments, user interfaces (1.3.3) near-real time applications (1.3.4) CrossGrid vs Datagrid - complementary interactive (CG) vs non-interactive access/analyses file-level (DG) vs object-level (CG) emphasis on integration and user-friendly interfaces TIME to start!

3. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 What events? Collisions of particles – patient continuation of the Ernest Rutherford experiment in 1911 LHC missiles and targets: 7+7 TeV, from protons to Pb-nuclei. From 2 to 100 000 debris per colission, recorded in milions of channels of tracking detectors and calorimeters REAL EVENTS produced at CERN at 40 MHz rate propagating through detector systems with the speed of light buffered and filtered in multi-level trigger system (subtask 1.3.4 ? - listen to K.Korcyl) required reduction rate: 6 – 7 orders of magn. volume of one event ~ n Mbyte (n is small) initial processing of recorded data: 100Mev/y the rule of thumb: reconstruction takes only few percent of the corresponding simulation time ARTIFICIAL EVENTS produced at any place by MC techniques propagation through detector systems takes from nn minutes to 24 hours/event (700 MHz Pentium III =~ 28 SI95)! modern HEP experiments do not understand raw data without the corresponding MC samples MC samples should be 5 – 10 times larger

4. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 What people? LHC users in Europe: 267 institutes 4603 users LHC users outside Europe: 208 institutes 1632 users CrossGrid partners:

5. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 CrossGrid focuses on preparation of interactive applications for physics analyses. Done by distributed physics groups working on distributed databases. Hence, CG plans to optimise the use of distributed databases. In particular, test and verify the use of database managment systems OO or O/R ROOT or other HEP specific solutions SUBTASK 1.3.1 Interactive Distributed Data Access

6. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 This task is closely related to the previous 1.3.1. Should the user job be performed at each database server ? Or Be a task duplicated amongst many GRID machines? A tool based on the ANN (artificial neural network) technique is reported as appropriate for data-minig and already studied by CSIC. SUBTASK 1.3.2 Data-mining techniques on GRID

7. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 CG not only concentrates on interactive analyses of distributed data but declares development of comfortable conditions for users. Integrated common interface to various experimental frameworks. Also, e.g. through the use of WP3 portal tools. SUBTASK 1.3.3 Integration and Deployment

8. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 level 1 - special hardware 40 MHz (40 TB/sec) level 2 - embedded processors level 3 - PCs 75 KHz (75 GB/sec) 5 KHz (5 GB/sec) 100 Hz (100 MB/sec) data recording & offline analysis Subtask 1.3.4 Application to... High Level Trigger Challenging extention of the GRID concept for the near-synchronous applications !

9. CrossGrid Workshop, Kraków, 5 – 6 Nov-2001 Subtask 1.3.5 DISSEMINATION JUST STARTED